[src/trunk]: src/sys/dev/pci - Avoid undefined behavior in bge_setmulti(). fo...

[msaitoh <msaitoh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/93ab3a520826
branches:  trunk
changeset: 462895:93ab3a520826
user:      msaitoh <msaitoh%NetBSD.org@localhost>
date:      Tue Jul 30 15:50:08 2019 +0000

description:
- Avoid undefined behavior in bge_setmulti(). found by kUBSan.
- Avoid undefined behavior when setting the MAC address in bge_init().
  found by kUBSan.

diffstat:

 sys/dev/pci/if_bge.c |  9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diffs (37 lines):

diff -r 103778be116c -r 93ab3a520826 sys/dev/pci/if_bge.c
--- a/sys/dev/pci/if_bge.c      Tue Jul 30 15:29:40 2019 +0000
+++ b/sys/dev/pci/if_bge.c      Tue Jul 30 15:50:08 2019 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_bge.c,v 1.335 2019/07/09 08:46:58 msaitoh Exp $     */
+/*     $NetBSD: if_bge.c,v 1.336 2019/07/30 15:50:08 msaitoh Exp $     */
 
 /*
  * Copyright (c) 2001 Wind River Systems
@@ -79,7 +79,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_bge.c,v 1.335 2019/07/09 08:46:58 msaitoh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_bge.c,v 1.336 2019/07/30 15:50:08 msaitoh Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -1827,7 +1827,7 @@
                /* Just want the 7 least-significant bits. */
                h &= 0x7f;
 
-               hashes[(h & 0x60) >> 5] |= 1 << (h & 0x1F);
+               hashes[(h & 0x60) >> 5] |= 1U << (h & 0x1F);
                ETHER_NEXT_MULTI(step, enm);
        }
        ETHER_UNLOCK(ec);
@@ -5530,7 +5530,8 @@
        /* Load our MAC address. */
        m = (const uint16_t *)&(CLLADDR(ifp->if_sadl)[0]);
        CSR_WRITE_4(sc, BGE_MAC_ADDR1_LO, htons(m[0]));
-       CSR_WRITE_4(sc, BGE_MAC_ADDR1_HI, (htons(m[1]) << 16) | htons(m[2]));
+       CSR_WRITE_4(sc, BGE_MAC_ADDR1_HI,
+           ((uint32_t)htons(m[1]) << 16) | htons(m[2]));
 
        /* Enable or disable promiscuous mode as needed. */
        if (ifp->if_flags & IFF_PROMISC)